EP 1043873 A4 20050504 - SYNCHRONIZATION ACQUIRING CIRCUIT
Title (en)
SYNCHRONIZATION ACQUIRING CIRCUIT
Title (de)
SCHALTUNG ZUM ERREICHEN VON SYNCHRONITÄT
Title (fr)
CIRCUIT D'ACQUISITION DE SYNCHRONISATION
Publication
Application
Priority
- JP 9805198 W 19981119
- JP 33374597 A 19971119
- JP 33191998 A 19981109
Abstract (en)
[origin: EP1043873A1] There is provided a synchronization acquiring circuit for stably acquiring frame synchronization without pseudo-synchronization lock when the frame synchronization is acquired in reception at the time of a low C/N. The C/N value of a transmission path is determined by a C/N determining circuit 9 and a correlation detection reference value is obtained on the basis of the determined C/N value. The synchronization pattern of a received frame is detected by a frame synchronization detecting circuit 2. The bits of the synchronization pattern of the received frame are compared with those of a frame synchronization pattern on the transmitting side by a frame synchronizing circuit 5 to obtain the number of coincided bits. The frame synchronization is regarded as detected when the obtained number of bits of each frame is equal to or larger than the correlation detection value. When a reception signal phase vector distribution judging circuit 8 detects that a distribution vector of signal point positioning of a TMCC interval is normal and a burst symbol signal error measuring/judging circuit 10 judges that the distribution vector of a burst symbol signal is normal, synchronization is regarded as established. <IMAGE>
IPC 1-7
IPC 8 full level
H04J 3/06 (2006.01); H04L 1/20 (2006.01); H04L 7/08 (2006.01); H04L 27/22 (2006.01); H04L 7/00 (2006.01)
CPC (source: EP US)
H04J 3/0605 (2013.01 - EP US); H04J 3/0608 (2013.01 - EP US); H04L 27/22 (2013.01 - EP US); H04L 7/0083 (2013.01 - EP US)
Citation (search report)
- [E] US 5886999 A 19990323 - KOJIMA JUN [JP], et al & JP H07240906 A 19950912 - FUJITSU LTD
- [X] US 5440265 A 19950808 - COCHRAN BRUCE A [US], et al
- [A] EP 0658993 A1 19950621 - ALCATEL TELSPACE [FR]
- [A] EP 0757461 A2 19970205 - HARRIS CORP [US]
- [A] EP 0431957 A2 19910612 - NEC CORP [JP]
- See references of WO 9926386A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1043873 A1 20001011; EP 1043873 A4 20050504; EP 1043873 B1 20070214; CA 2310500 A1 19990527; CA 2310500 C 20080909; CN 1181656 C 20041222; CN 1279855 A 20010110; DE 69837109 D1 20070329; DE 69837109 T2 20070606; JP 3017983 B2 20000313; JP H11234357 A 19990827; US 6526107 B1 20030225; WO 9926386 A1 19990527
DOCDB simple family (application)
EP 98954737 A 19981119; CA 2310500 A 19981119; CN 98811283 A 19981119; DE 69837109 T 19981119; JP 33191998 A 19981109; JP 9805198 W 19981119; US 53096200 A 20000712